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Carbon Source-Dependent Expansion of the Genetic Code in Bacteria

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Carbon Source-Dependent Expansion of the Genetic Code in Bacteria Carbon source-dependent expansion of the genetic code in bacteria Laure Prata, Ilka U. Heinemanna, Hans R. Aernib, Jesse Rinehartb,c, Patrick O’Donoghuea,1, and Dieter Sölla,d,1 Departments of aMolecular Biophysics and Biochemistry, bCellular and Molecular Physiology, cSystems Biology Institute, and dChemistry, Yale University, New Haven, CT 06520 Contributed by Dieter Söll, October 25, 2012 (sent for review October 5, 2012) Despite the fact that the genetic code is known to vary between coli, and is sufficient to promote limited read-through of amber organisms in rare cases, it is believed that in the lifetime of a single codons (10, 11). A Methanosarcina acetivorans strain lacking cell the code is stable. We found Acetohalobium arabaticum cells tRNAPyl is viable when cells are grown on methanol as a carbon grown on pyruvate genetically encode 20 amino acids, but in the source, but detrimental for growth on methylamines (12). This presence of trimethylamine (TMA), A. arabaticum dynamically led to the initial assumption that Pyl was solely required in the expands its genetic code to 21 amino acids including pyrrolysine catalytic active site of methylamine methyltransferases that are (Pyl). A. arabaticum is the only known organism that modulates highly up-regulated on methylamines and repressed on methanol the size of its genetic code in response to its environment and (13, 14). We demonstrated, however, that Pyl can be incorporated energy source. The gene cassette pylTSBCD, required to biosynthe- in tRNAHis guanylyltransferase (Thg1), an enzyme that is not in- size and genetically encode UAG codons as Pyl, is present in the volved in methylamine metabolism, and interestingly, Pyl does not genomes of 24 anaerobic archaea and bacteria. Unlike archaeal participate in the catalytic activity of this enzyme (15). Additionally Pyl-decoding organisms that constitutively encode Pyl, we ob- it has been shown that tRNAPyl is expressed independently of the served that A. arabaticum controls Pyl encoding by down-regulat- carbon source in Methanosarcina mazei (16) and that Pyl-containing ing transcription of the entire Pyl operon under growth conditions proteins were recovered from M. acetivorans cells grown on lacking TMA, to the point where no detectable Pyl-tRNAPyl is made methanol (15). These studies indicate that the expression of in vivo. Pyl-decoding archaea adapted to an expanded genetic particular Pyl-containing proteins is regulated in archaeal code by minimizing TAG codon frequency to typically ∼5% of organisms, but Pyl-tRNAPyl formation and encoding of UAG MICROBIOLOGY ORFs, whereas Pyl-decoding bacteria (∼20% of ORFs contain in- as Pyl is constitutive and has not been shown to be regulated frame TAGs) regulate Pyl-tRNAPyl formation and translation of during the lifetime of the cell. UAG by transcriptional deactivation of genes in the Pyl operon. Our current understanding of Pyl decoding is based on the We further demonstrate that Pyl encoding occurs in a bacterium knowledge of 24 known Pyl-decoding organisms, with about half that naturally encodes the Pyl operon, and identified Pyl residues of them in the Methanosarcina family of archaeal methanogens by mass spectrometry in A. arabaticum proteins including two and the others consisting of a diverse group of bacteria. Partly methylamine methyltransferases. due to the lack of genetic tools (17), Pyl decoding in these bacteria has not been investigated in vivo. PylRS and tRNAPyl codon reassignment | pyrrolysyl-tRNA synthetase | from Desulfitobacterium hafniense (18) and from Methanosarcina Desulfitobacterium dehalogenans | Desulfitobacterium hafniense (19) are well characterized in vitro, and the information gained from the structural data (20, 21) led to the development of many n most organisms the genetic code of 64 nucleotide triplets is orthogonal tRNA/synthetase pairs used for unnatural amino acid Idecoded into 20 canonical amino acids, whereas three codons incorporation (22, 23). In a heterologous E. coli context, PylRS signal translational stop. Across the diversity of life the genetic and tRNAPyl from D. hafniense are active in UAG suppression in code has been shown to vary in both size and codon assignment vivo (18). Despite this progress, there has been no observation of in some organisms, and especially in organelles. It is believed, Pyl decoding in a bacterium that naturally contains the Pyl operon. however, that within a single cell the genetic code remains static Here we investigate in vivo expression of Pyl operon gene prod- Pyl (i.e., the number of amino acids encoded is constant) and de- ucts, Pyl-tRNA formation, and the production of Pyl-containing termined by the aminoacyl-tRNA synthetases and tRNAs enco- proteins in putative Pyl-decoding bacterial species including ded in the genome. There are 22 genetically encoded amino Acetohalobium arabaticum, Desulfitobacterium dehalogenans,and acids, including selenocysteine (Sec) and pyrrolysine (Pyl); D. hafniense. whereas many organisms have an expanded genetic code with Results 21 amino acids (either Sec or Pyl), only few organisms have 22 amino acids by using Sec and Pyl (1). In the expansion of the Diversity of Pyl-Decoding Organisms. Since the discovery of pyrro- genetic code with selenocysteine, an elaborate recoding machinery lysine in archaea (6), the list of organisms possessing the Pyl op- ∼ is required where RNA secondary structure elements specify eron expanded, representing 0.7% of all sequenced genomes. certain UGA codons as Sec, whereas in their absence UGA Using BLAST with known PylRS sequences reveals homologs in codons remain termination signals (2). Pyl, on the other hand, 24 species including 15 bacteria (Fig. 1A). The gene encoding Pyl ′ which is well characterized in archaeal methanogens (3), is enco- tRNA (pylT) is present at the 5 end of the Pyl operon, which is ded by UAG (4, 5), suggesting that any TAG codon in the genome organized differently in archaeal versus bacterial examples (9). of these organisms could (if expressed) lead to Pyl insertion. Pyl was first identified in the active site of an archaeal meth- yltransferase (4, 6), which is required for growth on methyl- Author contributions: L.P., I.U.H., P.O., and D.S. designed research; L.P. and H.R.A. performed research; L.P., I.U.H., H.R.A., J.R., P.O., and D.S. analyzed data; and L.P., amines. The components needed for recoding UAG from stop to I.U.H., P.O., and D.S. wrote the paper. Pyl exist in 24 species usually on a single operon. In addition to The authors declare no conflict of interest. Pyl encoding tRNA CUA and pyrrolysyl-tRNA synthetase (PylRS) 1To whom correspondence may be addressed. E-mail: [email protected] or patrick. (7, 8), this operon encodes for PylB, PylC, and PylD, the only [email protected]. enzymes required for the biosynthesis of free Pyl (9). It has been This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10. shown that the Pyl operon can be transferred into Escherichia 1073/pnas.1218613110/-/DCSupplemental. www.pnas.org/cgi/doi/10.1073/pnas.1218613110 PNAS Early Edition | 1of6 Downloaded by guest on September 23, 2021 A Bilophila wadsworthia Bilophila sp. Endosymbiont of Olavius algarvensis Thermincola potens Desulfosporosinus orientis Desulfosporosinus meridiei Desulfosporosinus yougiae Desulfitobacterium hafniense DP7 Desulfitobacterium hafniense Y51 Desulfitobacterium hafniense DCB-2 Desulfitobacterium dehalogenans Desulfotomaculum acetoxidans Desulfotomaculum gibsoniae Acetohalobium arabaticum Methanococcoides burtonii Methanohalophilus mahii Methanohalobium evestigatum Methanosalsum zhilinae Methanosarcina thermophila Methanosarcina acetivorans 0.1 Methanosarcina mazei Methanosarcina barkeri Fusaro Methanosarcina barkeri MS B Archaea M. acetivorans pylS pylB pylC pylD Bacteria A. arabaticum mttB mttC Sn pylSc pylB hyuA-like pylC pylD D. dehalogenans pylSc mttC mttB rocR dhpS pylB pylC pylD Sn D. hafniense pylSc pylB pylC pylD Sn Fig. 1. Phylogenetic distribution of Pyl decoding. (A) To date, the pylRS genes encoding the pyrrolysyl-tRNA synthetase required for pyrrolysine decoding have been found in 24 organisms from archaeal and bacterial domains. Desulfobacterium autotrophicum is not included here because it possesses only a truncated version of pylSc.(B) Genomic arrangement genes required for Pyl decoding; the gene products of pylB, pylC, and pylD biosynthesize pyrrolysine, which is charged onto tRNAPyl (pylT, indicated by the black box) by its cognate pyrrolysyl-tRNA synthetase PylRS. Whereas PylRS is encoded by one gene in archaea (pylS), separate bacterial origin. The specific function of these putative proteins pylSn and pylSc genes encode the N-terminal and C-terminal and their involvement in the Pyl system remain unknown. polypeptides of PylRS in bacteria, respectively. Most Pyl-decoding bacteria, except the deepest branching bacterial PylRS from TMA-Dependent Induction of Pyl-tRNAPyl Formation in A. arabaticum. A. arabaticum, encode the N-terminal domain at the 3′ end of the To determine whether tRNAPyl is expressed in putative Pyl- operon. It is still not known how or if these separated domains decoding bacteria, total RNA was isolated from cells grown function in trans.InA. arabaticum,thepylSn is upstream of pylSc either on pyruvate (Pyr) or trimethylamine (TMA) and ana- (as in archaea) but the two genes are encoded in different reading lyzedbyNorthernblot.Wefocusedonthreebacterialstrains frames (9). The separated pylSn gene of A. arabaticum may have D. hafniense (DCB-2), D. dehalogenans,andA. arabaticum. been inherited or acquired by other bacteria that subsequently The Northern blot analysis revealed that Pyl, in the conditions rearranged pylSn to the 3′ end of the operon, evolving an operonal tested, is not encoded in all organisms that contain the Pyl organization found in all other known Pyl-decoding bacteria. operon in their genome (Fig. 2). We observed that only The bacterial Pyl operon shows additional diversity, in that A. arabaticum and D. dehalogenans expressed tRNAPyl. Inter- Pyl operons from A. arabaticum and D. dehalogenans are inter- Pyl rupted by genes for the Pyl-containing trimethylamine methyl- estingly, the level of tRNA expression in A.
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